48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
|
// Copyright (c) Facebook, Inc. and its affiliates.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include "yarpl/flowable/Subscriber.h"
|
||
|
|
|
||
|
|
#include <stdexcept>
|
||
|
|
|
||
|
|
namespace yarpl {
|
||
|
|
namespace flowable {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A Subscriber that always cancels the subscription passed to it.
|
||
|
|
*/
|
||
|
|
template <typename T>
|
||
|
|
class CancelingSubscriber final : public BaseSubscriber<T> {
|
||
|
|
public:
|
||
|
|
void onSubscribeImpl() override {
|
||
|
|
this->cancel();
|
||
|
|
}
|
||
|
|
|
||
|
|
void onNextImpl(T) override {
|
||
|
|
throw std::logic_error{"CancelingSubscriber::onNext() can never be called"};
|
||
|
|
}
|
||
|
|
void onCompleteImpl() override {
|
||
|
|
throw std::logic_error{
|
||
|
|
"CancelingSubscriber::onComplete() can never be called"};
|
||
|
|
}
|
||
|
|
void onErrorImpl(folly::exception_wrapper) override {
|
||
|
|
throw std::logic_error{
|
||
|
|
"CancelingSubscriber::onError() can never be called"};
|
||
|
|
}
|
||
|
|
};
|
||
|
|
} // namespace flowable
|
||
|
|
} // namespace yarpl
|